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Question

# For each notebook, the shopkeeper gets ₹ 4 as profit and for each pen he loses 20 paisa. The total profit he made was ₹ 40. If he sold 100 pens during that period, find the profit earned on notebooks. [Assume he only sold notebooks and pens during that period; Answer in terms of a number]

A
40
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B
60
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C
50
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D
30
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Solution

## The correct option is B ₹ 60Here, we denote profit with '+' and loss with '-' Loss on selling 1 pen = 20 paisa = - ₹ 0.2 So, loss on selling 100 pens = ₹ (−0.2×100) = - ₹ 20 Total gain = Profit earned on notebooks + Loss incurred on pens So, Profit earned on notebooks = Total gain - Loss incurred on pens = ₹ 40 - (- ₹ 20) = ₹ 40 + ₹ 20 = ₹ 60

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